package com.itheima.service;

import com.itheima.domain.Student;

import java.util.ArrayList;

public interface IStudentService {
    //增
    void addStudent(Student student);
    //删
    void deleteStudent(String sid);
    //改
    void updateStudent(String sid,Student newStu);
    //查
    ArrayList<Student> findAllStudents();
    //判断
    boolean isExists(String sid);
}
